Mk 2 focus immobiliser fault

[pommyy]

Hi Guys, 

Now i am guessing this isnt the first time this topic has been discussed?

But i am in need of a little assistance.

i have a 2006 1.8tdci flashing immobiliser code 16. No crank!

would not start after stopping for a short amount of time at work.  

I have checked the obvious "fuses fuse boxes multi plugs keys!! and still nothing jumping out at me.

Any help will be gratefully received.